Math
posted by Pat on .
Determine the total amount of interest you will pay over the next 3 months on a credit balance of $725 if your credit card has an annual interest rate of 18% and you make monthly payments of 10% of the amount due, rounded to the nearest dollar.

month 1:
interest due = 725(.015) = 10.875
balance owing =735.875
payment made = 73.58
reduction in balance = 73.58  10.875 =62.71
balance at end of month 1 = 662.29
month 2
interest due = 662.29(.015) = 9.93
balance owing = 672.22
payment made = 67.22
reduction in balance = 67.229.93 = 57.29
balance at end of month 2 = 614.93
month 3
(repeat above steps)
add up the interest for the three months.
check my arithmetic